What are the examination items of corneal ulcer?

summary

Cornea is a transparent film in the front of the eyeball. It is often exposed to air and has more chances to contact germs. Corneal ulcer often occurs because of foreign body trauma, corneal foreign body removal injury, trachoma and its complications, inverted eyelashes stabbing the cornea, bacteria, viruses or fungi entering the opportunity, causing infection. In addition, such as tuberculosis caused by allergy, vitamin A deficiency, facial paralysis and eyelid scar caused by eyelid closure can cause corneal ulcer. What are the examination items of corneal ulcer? Next, I'd like to share my views with you.

What are the examination items of corneal ulcer?

A small piece of necrotic tissue on the ulcer surface was taken by fungal smear method and placed on the slide. A small drop of 5% potassium hydroxide solution was dropped on the slide, covered with cover glass, and slightly pressed. Fungal hyphae can be detected by high power microscope. Most of them are full of vision, but a small amount of hyphae can only be found by careful examination. If the smear is positive, the diagnosis can be confirmed. The specimen should be examined at that time and cannot be preserved.

In fungal culture, a small piece of necrotic tissue was taken and placed on the slope of solid potato or Sabouraud medium. If inoculated on several media at the same time, it will help to increase the positive rate of culture. Put it in a 37 ℃ oven and observe it every day. Fungal organisms could be found from the next day after inoculation. If there is no growth after one week, it is positive. The culture method can be used to observe the morphology and color of the fungal colonies, examine the hyphae and spores under the microscope, identify the bacteria, preserve the bacteria and conduct drug sensitivity test. The positive rate of culture is generally low on smear.

If the patient has one of the following conditions, further pathogen examination should be performed. ① Rural patients had a history of agricultural trauma such as rice, keratitis or foreign body removal before onset. ② The ulcer could not be controlled by long-term drip or subconjunctival injection of multiple antibiotics.

matters needing attention

We should have a lot of understanding in our life, especially for the early symptoms of corneal ulcer, self-awareness as soon as possible, and prepare for the prevention of corneal ulcer. If it is serious, we should go to a professional facial hospital for scientific examination as soon as possible, and targeted treatment of corneal ulcer, so as to avoid the vicious attack of the disease.